/*
 * Copyright 2018 Meituan Dianping. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.meituan.dorado.rpc.handler;

import com.meituan.dorado.codec.octo.meta.MessageType;
import com.meituan.dorado.common.RpcRole;
import com.meituan.dorado.common.extension.ExtensionLoader;

public class DoradoHandlerFactory extends AbstractHandlerFactory {

    private InvokeHandler scannerHeartBeatInvokeHandler;

    @Override
    protected InvokeHandler getOtherInvocationHandler(int messageType, RpcRole rpcRole) {
        if (MessageType.ScannerHeartbeat.getValue() == messageType) {
            if (scannerHeartBeatInvokeHandler == null) {
                scannerHeartBeatInvokeHandler = createScannerHeartBeatInvocationHandler();
            }
            return scannerHeartBeatInvokeHandler;
        }
        return null;
    }

    private InvokeHandler createScannerHeartBeatInvocationHandler() {
        InvokeHandler heartBeatInvokeHandler = ExtensionLoader
                .getExtensionWithName(HeartBeatInvokeHandler.class, "scanner");

        if (heartBeatInvokeHandler == null) {
            throw new IllegalStateException("Can not found scanner impl of " + HeartBeatInvokeHandler.class);
        }
        return heartBeatInvokeHandler;
    }
}
